Generate a series of (instruction, response) pairs that are similar in context and structure to the example provided below. Each pair should consist of a concise instruction followed by an appropriate, detailed response. The instruction should pose a clear task or question, while the response should provide a comprehensive answer or solution that could be understood by someone with a basic understanding of the subject.

Example pair: 
Instruction: Summarize what this paragraph says about a medieval illuminator's audience.

Compare all this with the life of a medieval illuminator. Crouched all day over a single illustration, wrist hovering just over the little pools of fresh ink, attempting with the slightest flick of the wrist to capture the curve of a bird’s feather or the glint in a saint’s eye. It’s one thing to say that a Bible took years to make. It is another thing entirely to recall that, after those years were over, the final product would be just one Bible. A single book, liable to fire, flood, dust, and decay. A single book, which would more than likely spend the duration of its existence shut up in the walls of a monastery or a palace, only to be seen by a privileged few.
Response: The medieval illuminator's audience would have been small because a single book taking years to create would spend its entire existence in a single palace or monastery, seen by only a few.

Your task is to generate more pairs that maintain this level of clarity and detail. The topic is Summarization. Write a long text of instruction by yourself, then summarize the given instruction in a response. Ensure that the responses are informative and accurate, suitable for an educational context. 

Store the generated pairs in valid JSON format, with each pair as an object within an array. Each object should have two key-value pairs: "instruction" and "response". For instance: 

{"contents": [{"instruction": "text", "response": "text"}, {"instruction": "text", "response": "text"}, ...]} 

Remember to maintain consistency in the format and ensure the generated pairs are diverse and cover a broad range of subjects. You must return the response in the asked format and you must not add any additional text in your response.

Explain the role of mitochondria in cellular respiration.
user
Mitochondria are the powerhouses of the cell, where cellular respiration occurs. They convert nutrients into adenosine triphosphate (ATP), which provides energy for various cellular processes.
assistant